Update how fake emails are generated

[porcellus]

We are updating how fake emails are generated (and detected), because fakeemail.com is not a domain we are controlling. Related: https://github.com/supertokens/supertokens-node/pull/741/files#diff-b14fb90617b51ab3230266bd4cff0646a932edda9f411eec40598d4016d76b39

[mavwolverine]

It would also be good if user_info_dict and oauth tokens were made available to the fake email function. That way, if I need to create a custom fake email and need to call an API, I can use the tokens.

[rishabhpoddar]

The generate_fake_email function is only meant to generate a fake email randomly. You can instead override the get_user_info function of the provider to return an email in the user info object, and in this function, you have access to the oauth tokens.